Material Analysis
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MP hardness too high
Problem Phenomenon
MP product Shore hardness 5-10 degrees higher than the target, hard to the touch
Cause Analysis
MP crystallinity high, rigidity increased; filler added too much; cooling too fast, crystallization incomplete but rigidity frozen
Solution
1) reduce cooling rate to complete crystallization and reduce the hard feel; 2) reduce filler addition; 3) add plasticizer 0.5wt% to lower hardness
Key Takeaway
high hardness is caused by crystallization and filler; adjusting cooling and filler are key
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